Font size
WorksheetsDAY 31 WORKSHEET KWA - (Threading and Fasteners)
Total questions: 15
Worksheet time: 8mins
Which thread form has unequal flank angles specifically designed for heavy unidirectional thrust transmission?
Square
Buttress
Metric
Knuckle
The pitch diameter of a thread is defined as —
Smallest diameter of thread
Largest diameter of thread
Diameter where thread thickness = space thickness
Mean of major & minor diameters
Which thread series is specified in IS:4218?
Whitworth
Metric
BA
Unified
For ACME threads, the included angle is —
47.5°
55°
60°
29°
A Type C stud is preferred when threaded into —
Steel body
CI body
Aluminium body
Hardened steel body
Knuckle threads are semicircular in profile and are mostly used in hose couplings and valve fittings.
True
False
In a double-start thread, the lead is half the pitch.
True
False
Assertion (A): ACME threads are commonly used in power screws where high wear resistance is required. Reason (R): Their flank angle (29°) reduces wedging action and provides better sliding contact.
A True, R True and R explains A
A True, R True but R not explanation
A True, R False
A False, R True
In square threads, the depth of thread is equal to (a)
The lead of a triple-start thread is ..
(a)
The thickness of a ring nut is approximately
(a)
The chamfer radius for a square nut is usually .
(a)
Hexagonal bolt head thickness is specified as 0.8 × d (IS:3138).
(a)
MATCH SET 1 – (Thread → Application)
A. Square thread→4. Bottle caps
B. Buttress thread→3. Lead screws in lathes
C. Knuckle thread→1. Heavy unidirectional thrust
D. ACME thread→2. Screw jacks / heavy loads
A–1, B–2, C–4, D–3
A–2, B–1, C–4, D–3
A–2, B–4, C–1, D–3
A–2, B–1, C–3, D–4
MATCH SET 2 – (Nuts & Special Features)
A. Ring nut→3.Dome top prevents corrosion
B. Cap nut→1. Operated by hook spanner
C. Collared nut→2. Washer face to avoid scratching
D. Capstan nut→4. Shoulder-type locking
A–3, B–1, C–4, D–2
A–1, B–3, C–2, D–4
A–1, B–3, C–4, D–2
A–1, B–4, C–3, D–2
